상시진동을 이용한 영광4호기 격납건물의 모달파라메터 산정

To date, to maintain the structural integrity of a containment, physical and chemical tests as well visual inspection have been conducted on the containment structure periodically. However, in evaluating the overall structural condition of the containment, such parameters as resonant frequencies can provide more useful information on the global structural condition. In this paper, modal parameters, i.e. resonant frequencies and corresponding mode shapes, of the Yunggwang Unit 4 containment are estimated using ambient vibration measurements. The relevance of the estimated modal parameters to analytical modal parameters is established using the modal assurance criterion.